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  #1  
Old 11-05-2012, 04:44 AM
vianaj vianaj is offline
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Default Speed & Tacho signals

I'm willing to build a DYI Gear Indicator...
For that I need to know the ratios between ECU pin 6 Speed Sensor signal and ECU pin 47 Tachometer signals. Those signals are also available at cluster pins 5 and 6...
I know that speed sensor output 4 pulses per sprocket rev., because the sensor senses a square nut concentric with sprocket.
I do not know the relationship between crankshaft (ECU pins 13, 30) and Tachometer signal, but I will use this last one. Timing rotor has 22 teeth, therefore Crankshaft Sensor signals might output 22 pulses by revolution, but this signal is differential and pulses do noy have all the same duration. For the Tacho signal, the service manual refers that 133Hz will display 4000 RPM. Well, 4000 RPM is 66.6Hz hence, this signal might be 2 pulses per revolution.
If anyone has already checked those signals, comments are welcome. Thanks. Jose.
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  #2  
Old 11-05-2012, 06:58 AM
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genehil genehil is offline
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So how long have you worked on the Mars rover?
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  #3  
Old 11-05-2012, 10:06 AM
vianaj vianaj is offline
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Till now, just on papers! :-)
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Old 11-06-2012, 01:34 AM
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Why not buy a cheap, magnet based, gear indicator?
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Old 11-06-2012, 09:55 AM
vianaj vianaj is offline
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There are advantages and inconvenients in both GI either based on lever position or speed/tacho ratio...

V gearbox is too stiff... not very precise... therefore I think the GI will count even when gear is not engaged...

For such system, I would prefer to use an internally installed optical fiber laser detector instead of magnetic hall effect ones.

Let's see...
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Old 11-06-2012, 11:09 AM
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Quote:
Originally Posted by genehil View Post
So how long have you worked on the Mars rover?
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My KLR trip to Alaska, YT, NWT and BC in summer 2009
http://www.klr650.net/forums/showthread.php?t=69383

My Versys trip to D2D 2013, and Alaska, June '13
http://www.kawasakiversys.com/forums...ad.php?t=33153
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  #7  
Old 02-13-2013, 12:55 PM
ibonneau ibonneau is offline
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Quote:
Originally Posted by vianaj View Post
I'm willing to build a DYI Gear Indicator...
For that I need to know the ratios between ECU pin 6 Speed Sensor signal and ECU pin 47 Tachometer signals. Those signals are also available at cluster pins 5 and 6...
I know that speed sensor output 4 pulses per sprocket rev., because the sensor senses a square nut concentric with sprocket.
I do not know the relationship between crankshaft (ECU pins 13, 30) and Tachometer signal, but I will use this last one. Timing rotor has 22 teeth, therefore Crankshaft Sensor signals might output 22 pulses by revolution, but this signal is differential and pulses do noy have all the same duration. For the Tacho signal, the service manual refers that 133Hz will display 4000 RPM. Well, 4000 RPM is 66.6Hz hence, this signal might be 2 pulses per revolution.
If anyone has already checked those signals, comments are welcome. Thanks. Jose.
Some posts just make me feel dumb.

I hope you can make it and then explain how to all us simple people
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  #8  
Old 02-13-2013, 01:04 PM
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Quote:
Originally Posted by vianaj View Post
I'm willing to build a DYI Gear Indicator...
For that I need to know the ratios between ECU pin 6 Speed Sensor signal and ECU pin 47 Tachometer signals. Those signals are also available at cluster pins 5 and 6...
I know that speed sensor output 4 pulses per sprocket rev., because the sensor senses a square nut concentric with sprocket.
I do not know the relationship between crankshaft (ECU pins 13, 30) and Tachometer signal, but I will use this last one. Timing rotor has 22 teeth, therefore Crankshaft Sensor signals might output 22 pulses by revolution, but this signal is differential and pulses do noy have all the same duration. For the Tacho signal, the service manual refers that 133Hz will display 4000 RPM. Well, 4000 RPM is 66.6Hz hence, this signal might be 2 pulses per revolution.
If anyone has already checked those signals, comments are welcome. Thanks. Jose.

Just reading that made my head hurt. I'd just spend the $104 on a gear shift indicator and call it good, but I admire your gumption (I'm not technically old enough to use that work appropriately).
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  #9  
Old 02-13-2013, 01:29 PM
paretlane paretlane is offline
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I saw one on eBay for $24 shipped.
http://www.ebay.com/itm/Blue-Univers...-/250868414833
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